Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48a493f87bd9ebf…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 19:48:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 28a38f0222959133d2117710fbb11b03 SHA-1: c0a139c853529e50ac068bf667b2c20cd083ffac SHA-256: c48a493f87bd9ebf73dd409500660c734157fb388bec65b3925ffcebb7103511
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The primary lure is a 'free generator / game hack' promising coins and spins, which directs users to 'http://netcdn.tw/app/406889139/free-coin-master-spins-2021-game-hack'. This suggests the document is designed to trick users into downloading potentially malicious content or visiting compromised sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/free-coin-master-spins-2021-game-hack In PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/youtube-roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/como-usar-hacks-en-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-with-proof_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/hacks-para-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • https://www.vireco.net/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3302 22732 bytes
SHA-256: 41f172f3780cf54584ed5961e7b9564c112e8501a142341064b19d643adbc906
font_01_sfnt_off000065d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 18576 bytes
SHA-256: b91ca07aeadef02c4833a5be8b217bc3af90c6c550000b8c217b6d13a7f4cb5d

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